Dip also has several vernacular meanings. It's often used a synonym for smokeless tobacco, specifically the kind of loose-cut and moistened snuff that one takes by packing into the space between the lower lip and the gums. This presumably comes from the usage of the verb dip for the taking of that tobacco, which is old enough that even dear old webbie notes it.

In some dialects of the American mid-Atlantic seaboard, dip is also an intransitive verb which, depending on context, means either or both of "to depart" or "to move quickly". When used in the second sense, it usually carries overtones of being pursued. I've got no idea of the etymology of this use, though I suspect it may have its immediate origins in AAVE.

To plunge or immerse; especially, to put for a moment into a liquid; to insert into a fluid and withdraw again.

The priest shall dip his finger in the blood.Lev. iv. 6.

[Wat'ry fowl] now dip their pinions in the briny deep.Pope.

While the prime swallow dips his wing.Tennyson.

2.

To immerse for baptism; to baptize by immersion. Book of Common Prayer. Fuller.

3.

To wet, as if by immersing; to moisten. [Poetic]

A cold shuddering dewDips me all o'er.Milton.

4.

To plunge or engage thoroughly in any affair.

He was . . . dipt in the rebellion of the Commons.Dryden.

5.

To take out, by dipping a dipper, ladle, or other receptacle, into a fluid and removing a part; -- often with out; as, to dip water from a boiler; to dip out water.

6.

To engage as a pledge; to mortgage. [Obs.]

Live on the use and never dip thy lands.Dryden.

Dipped candle, a candle made by repeatedly dipping a wick in melted tallow. --To dip snuff, to take snuff by rubbing it on the gums and teeth. [Southern U. S.] --To dip the colors (Naut.), to lower the colors and return them to place; -- a form of naval salute.

A liquid, as a sauce or gravy, served at table with a ladle or spoon. [Local, U.S.] Bartlett.

4.

A dipped candle. [Colloq.] Marryat.

Dip of the horizon (Astron.), the angular depression of the seen or visible horizon below the true or natural horizon; the angle at the eye of an observer between a horizontal line and a tangent drawn from the eye to the surface of the ocean. --Dip of the needle, or Magnetic dip, the angle formed, in a vertical plane, by a freely suspended magnetic needle, or the line of magnetic force, with a horizontal line; -- called also inclination. --Dip of a stratum (Geol.), its greatest angle of inclination to the horizon, or that of a line perpendicular to its direction or strike; -- called also the pitch.

A gymnastic exercise on the parallel bars in which the performer, resting on his hands, lets his arms bend and his body sink until his chin is level with the bars, and then raises himself by straightening his arms.

2.

In the turpentine industry, the viscid exudation, which is dipped out from incisions in the trees; as, virgin dip (the runnings of the first year), yellow dip (the runnings of subsequent years).

3. (Aëronautics)

A sudden drop followed by a climb, usually to avoid obstacles or as the result of getting into an airhole.